Hosts

At Admin → Hosts keep the one registry of hosts for the whole installation: the machines reached over SSH (OpenSSH works on Windows too). A host is the machine and nothing more: name, address, port and system. The machine's host key is trusted on the first connection that gets in and enforced from then on, whichever credential is used. Two hosts at the same address are flagged, because that is one machine registered twice.

The registry, with names and addresses, is visible to everyone.